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XDocumentType Class

Represents an XML Document Type Definition (DTD).

System.Object
  System.Xml.Linq.XObject
    System.Xml.Linq.XNode
      System.Xml.Linq.XDocumentType

Namespace:  System.Xml.Linq
Assembly:  System.Xml.Linq (in System.Xml.Linq.dll)

'Declaration
Public Class XDocumentType _
	Inherits XNode

The XDocumentType type exposes the following members.

  NameDescription
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360XDocumentType(XDocumentType)Initializes an instance of the XDocumentType class from another XDocumentType object.
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360XDocumentType(String, String, String, String)Initializes an instance of the XDocumentType class.
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  NameDescription
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360BaseUriGets the base URI for this XObject. (Inherited from XObject.)
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360DocumentGets the XDocument for this XObject. (Inherited from XObject.)
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360InternalSubsetGets or sets the internal subset for this Document Type Definition (DTD).
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360NameGets or sets the name for this Document Type Definition (DTD).
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360NextNodeGets the next sibling node of this node. (Inherited from XNode.)
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360NodeTypeGets the node type for this node. (Overrides XObject.NodeType.)
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360ParentGets the parent XElement of this XObject. (Inherited from XObject.)
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360PreviousNodeGets the previous sibling node of this node. (Inherited from XNode.)
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360PublicIdGets or sets the public identifier for this Document Type Definition (DTD).
Public propertySupported by Silverlight for Windows PhoneSupported by Xbox 360SystemIdGets or sets the system identifier for this Document Type Definition (DTD).
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  NameDescription
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AddAfterSelf(Object)Adds the specified content immediately after this node. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AddAfterSelf(Object())Adds the specified content immediately after this node. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AddAnnotationAdds an object to the annotation list of this XObject. (Inherited from XObject.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AddBeforeSelf(Object)Adds the specified content immediately before this node. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AddBeforeSelf(Object())Adds the specified content immediately before this node. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360AncestorsReturns a collection of the ancestor elements of this node. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360Ancestors(XName)Returns a filtered collection of the ancestor elements of this node. Only elements that have a matching XName are included in the collection. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360Annotation(Type)Gets the first annotation object of the specified type from this XObject. (Inherited from XObject.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360Annotation(Of T)Get the first annotation object of the specified type from this XObject. (Inherited from XObject.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360Annotations(Type)Gets a collection of annotations of the specified type for this XObject. (Inherited from XObject.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360Annotations(Of T)Gets a collection of annotations of the specified type for this XObject. (Inherited from XObject.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360CreateReaderCreates an XmlReader for this node. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360CreateReader(ReaderOptions)Creates an XmlReader for this node. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360ElementsAfterSelfReturns a collection of the sibling elements after this node, in document order. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360ElementsAfterSelf(XName)Returns a filtered collection of the sibling elements after this node, in document order. Only elements that have a matching XName are included in the collection. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360ElementsBeforeSelfReturns a collection of the sibling elements before this node, in document order. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360ElementsBeforeSelf(XName)Returns a filtered collection of the sibling elements before this node, in document order. Only elements that have a matching XName are included in the collection. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360Equals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodSupported by Silverlight for Windows PhoneSupported by Xbox 360FinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360GetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360IsAfterDetermines if the current node appears after a specified node in terms of document order. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360IsBeforeDetermines if the current node appears before a specified node in terms of document order. (Inherited from XNode.)
Protected methodSupported by Silverlight for Windows PhoneSupported by Xbox 360MemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360NodesAfterSelfReturns a collection of the sibling nodes after this node, in document order. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360NodesBeforeSelfReturns a collection of the sibling nodes before this node, in document order. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360RemoveRemoves this node from its parent. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360RemoveAnnotations(Type)Removes the annotations of the specified type from this XObject. (Inherited from XObject.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360RemoveAnnotations(Of T)Removes the annotations of the specified type from this XObject. (Inherited from XObject.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360ReplaceWith(Object)Replaces this node with the specified content. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360ReplaceWith(Object())Replaces this node with the specified content. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360ToStringReturns the indented XML for this node. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360ToString(SaveOptions)Returns the XML for this node, optionally disabling formatting. (Inherited from XNode.)
Public methodSupported by Silverlight for Windows PhoneSupported by Xbox 360WriteToWrite this XDocumentType to an XmlWriter. (Overrides XNode.WriteTo(XmlWriter).)
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  NameDescription
Public eventSupported by Silverlight for Windows PhoneSupported by Xbox 360ChangedRaised when this XObject or any of its descendants have changed. (Inherited from XObject.)
Public eventSupported by Silverlight for Windows PhoneSupported by Xbox 360ChangingRaised when this XObject or any of its descendants are about to change. (Inherited from XObject.)
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  NameDescription
Public Extension MethodCreateNavigatorOverloaded. Creates an XPathNavigator for an XNode. (Defined by Extensions.)
Public Extension MethodCreateNavigator(XmlNameTable)Overloaded. Creates an XPathNavigator for an XNode. The XmlNameTable enables more efficient XPath expression processing. (Defined by Extensions.)
Public Extension MethodXPathEvaluate(String)Overloaded. Evaluates an XPath expression. (Defined by Extensions.)
Public Extension MethodXPathEvaluate(String, IXmlNamespaceResolver)Overloaded. Evaluates an XPath expression, resolving namespace prefixes using the specified IXmlNamespaceResolver. (Defined by Extensions.)
Public Extension MethodXPathSelectElement(String)Overloaded. Selects an XElement using a XPath expression. (Defined by Extensions.)
Public Extension MethodXPathSelectElement(String, IXmlNamespaceResolver)Overloaded. Selects an XElement using a XPath expression, resolving namespace prefixes using the specified IXmlNamespaceResolver. (Defined by Extensions.)
Public Extension MethodXPathSelectElements(String)Overloaded. Selects a collection of elements using an XPath expression. (Defined by Extensions.)
Public Extension MethodXPathSelectElements(String, IXmlNamespaceResolver)Overloaded. Selects a collection of elements using an XPath expression, resolving namespace prefixes using the specified IXmlNamespaceResolver. (Defined by Extensions.)
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  NameDescription
Explicit interface implemetationPrivate methodSupported by Silverlight for Windows PhoneSupported by Xbox 360IXmlLineInfo.HasLineInfoGets a value indicating whether or not this XObject has line information. (Inherited from XObject.)
Explicit interface implemetationPrivate propertySupported by Silverlight for Windows PhoneSupported by Xbox 360IXmlLineInfo.LineNumberGets the line number that the underlying XmlReader reported for this XObject. (Inherited from XObject.)
Explicit interface implemetationPrivate propertySupported by Silverlight for Windows PhoneSupported by Xbox 360IXmlLineInfo.LinePositionGets the line position that the underlying XmlReader reported for this XObject. (Inherited from XObject.)
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Data Type Definitions (DTD) in XML are a way to do the following:

  • Validate XML trees to a limited extent.

  • Expand entities, which is a form of text replacement.

  • Supply default attributes.

This class represents the XML concept of a DTD.

DTD support in LINQ to XML is limited. 

LINQ to XML will expand internal entities by default, but it will not resolve external entity references unless an XmlReader with an associated XmlResolver is used to load the XML tree.

LINQ to XML will not validate a document against a DTD, but you can use a validating XmlReader to perform DTD validation if necessary.

When a document contains entity references that are defined in a DTD, the references are expanded upon creation of the XML tree. However, when you serialize or save the XML tree, the content of the expanded entities is preserved; the entity references are not.

Default attributes from the DTD will be materialized as regular attributes in the XML tree. After a default attribute from the DTD is materialized, there is no way to determine that the attribute was a default attribute from the DTD.

You can populate an XML tree with an XML document that contains an internal DTD. The XML tree will then contain a DocumentType node. When you serialize or save the tree, the internal DTD will also be saved as part of the document.

The following example shows the use of this property to retrieve the node type for an XDocumentType object.


Dim output As New StringBuilder
Dim internalSubset = _
    "<!ELEMENT Pubs (Book+)>" & Environment.NewLine & _
    "<!ELEMENT Book (Title, Author)>" & Environment.NewLine & _
    "<!ELEMENT Title (#PCDATA)>" & Environment.NewLine & _
    "<!ELEMENT Author (#PCDATA)>"

Dim doc As XDocument = _
    <?xml version="1.0" encoding="utf-8" standalone="yes"?>
    <!--This is a comment.-->
    <?xml-stylesheet href='mystyle.css' title='Compact' type='text/css'?>
    <Pubs>
        <Book>
            <Title>Artifacts of Roman Civilization</Title>
            <Author>Moreno, Jordao</Author>
        </Book>
        <Book>
            <Title>Midieval Tools and Implements</Title>
            <Author>Gazit, Inbar</Author>
        </Book>
    </Pubs>
    <!--This is another comment.-->

doc.FirstNode.AddAfterSelf(New XDocumentType("Pubs", Nothing, Nothing, internalSubset))

output.Append(doc.DocumentType.NodeType.ToString())
output.Append(Environment.NewLine)

OutputTextBlock.Text = output.ToString()


Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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